From: Joe Conway <mail@joeconway.com>
To: Steve Wampler <swampler@noao.edu>
Cc: pgsql-sql@postgresql.org
Subject: Re: Replacing a simple nested query?
Date: Sun, 13 Jul 2003 15:01:13 -0700
Message-ID: <3F11D6A9.4040905@joeconway.com> (raw)
In-Reply-To: <20030713215042.GA18643@weaver.tuc.noao.edu>
References: <20030713215042.GA18643@weaver.tuc.noao.edu>
Steve Wampler wrote:
> I've got a simple nested query:
>
> select * from attributes where id in (select id from
> attributes where (name='obsid') and (value='oid00066'));
>
> that performs abysmally. I've heard this described as the
> 'classic WHERE IN' problem.
I may be missing something, but why can't you just do:
select * from attributes where name='obsid' and value='oid00066';
?
Joe
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To: pgsql-sql@postgresql.org
Cc: mail@joeconway.com, swampler@noao.edu
Subject: Re: Replacing a simple nested query?
In-Reply-To: <3F11D6A9.4040905@joeconway.com>
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